how to convert cdl channel to awgn channel in nrpdsch link level simulation

I am simulating nr pdsch throughput using 5g tool box in cdl channel.How can I do it for Awgn channel

Answer 1

[Sriram Tadavarty]

Hi Govindu,

The NR PDSCH Throughput example does addition of AWGN to the waveform passed through the CDL/TDL channel.

So, AWGN is already present in the example.

Hope this helps.

Regards,

Sriram

Answer 2

[PAVAN KUMAR]

Hi Sriram Tadavarty...

If I want to have only AWGN channel for PUSCH performance analysis, how to define the channel ? I want to simulate 'no fading' (Ideal) case.

Regards

Pavan

[Sriram Tadavarty]

Hi Pavan,

In the example, you can comment out this line and assign txWaveform to rxWaveform as such.

% [rxWaveform,pathGains,sampleTimes] = channel(txWaveform);
rxWaveform = txWaveform; 

Also, use practical channel estimator by setting the simParameters.PerfectChannelEstimator to false. The perfect channel estimator is set to false because it requires the knowledge of channel path gains and sample times.

Hope this helps.

Regards,

Sriram

Note: I think you asked a question in the Answer section, rather than Comment to the previous answer.

[PAVAN KUMAR]

Hi Sriram... Thanks for the help..

I do not want to have HARQ for the link level simulation. I am trying to run the same example without using HARQ by chaning following lines. Can you confirm me whether the result given by this modified code is correct ? Or am I missing anything ?

Regards

Pavan

% simParameters.PUSCHExtension.NHARQProcesses = 16;

simParameters.PUSCHExtension.EnableHARQ = false;

encodeULSCH.MultipleHARQProcesses = false;

decodeULSCH.MultipleHARQProcesses = false;

% harqSequence = 0:puschextra.NHARQProcesses-1;

% harqEntity = HARQEntity(harqSequence,rvSeq);

%if harqEntity.NewData

% trBlk = randi([0 1],trBlkSize,1);

% setTransportBlock(encodeULSCH,trBlk,harqEntity.HARQProcessID);

% if harqEntity.SequenceTimeout

% resetSoftBuffer(decodeULSCHLocal,harqEntity.HARQProcessID);

% end

% end

trBlk = randi([0 1],trBlkSize,1);

setTransportBlock(encodeULSCH,trBlk);

% procstatus = updateAndAdvance(harqEntity,blkerr,trBlkSize,puschIndicesInfo.G);